taxonID	type	description	language	source
D255879FFFCECD7C529E8BE8FBC8F84D.taxon	description	(Fig. 1)	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
D255879FFFCECD7C529E8BE8FBC8F84D.taxon	materials_examined	TYPE LOCALITY. — Ross Sea. TYPE MATERIAL. — Holotype • Ross Sea, McMurdo Sound; intestine of the Antactic toothfish Dissostichus mawsoni; 11. XI. 1964; USNPC 1358823. Paratype • Ross Sea, McMurdo Sound; intestine of zoarcid eelpout Rhigophila dearborni; 25. XI. 1964; USNPC 1358824. MATERIAL EXAMINED. — Ross Sea • 6 whole-mounted adult specimens, 2 slides with isolated ovarian complex, 5 slides with isolated terminal genitalia; intestine of Dissostichus mawsoni; 75 ° 44 ’ 7 ” S, 172 ° 56 ’ 8 ” W; 12. I. 2012; IPEE RAS 14315 (for whole-mounted specimens) • 3 whole-mounted adult specimens; intestine of Dissostichus mawsoni; 75 ° 40 ’ 3 ” S, 172 ° 26 ’ 1 ” W; 21. I. 2013; IPEE RAS 14316 • 1 whole-mounted adult specimen; intestine of Dissostichus mawsoni; 75 ° 28 ’ 2 ” S, 174 ° 37 ’ 6 ” W; 26. I. 2013; IPEE RAS 14317 • 1 sequenced adult specimen; intestine of Dissostichus mawsoni; 75 ° 25 ’ 3 ” S, 174 ° 32 ’ 7 ” W; 12. I. 2012; GenBank: OK 644193 (28 S rRNA gene).	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
D255879FFFCECD7C529E8BE8FBC8F84D.taxon	description	DESCRIPTION General morphology and digestive system Body elongate-oval, length 2.969 - 5.895 (3.844), maximum width 799 - 1.527 (1.174) at mid-body. Tegument unarmed. Pre-oral lobe absent. Oral sucker cup-shaped, 357 - 499 (419) / 271 - 585 (419), mouth opening terminal. Ventral sucker globular or subglobular, 357 - 628 (475) / 399 - 585 (497). Oral sucker to ventral sucker width ratio 1: 1.00 - 1.53 (1: 1.22). Forebody 24.5 - 30.9 (27.7) % of body length. Prepharynx short, distinct. Pharynx well-developed, 113 - 191 (149) / 106 - 184 (141). Oesophagus 92 - 289 (171). Pharyngeal and oesophagus glands distinct. Intestinal bifurcation in middle or posterior third of forebody. Caeca blind; distance from caecal ends to posterior end of body reaching 395 - 1031 (641). Male reproductive system Two testes, variously lobed, separate to slightly overlapped, oblique, post-equatorial; anterior testis sinistro-submedian, 257 - 514 (390) / 285 - 499 (384), posterior testis median or dextro-submedian, 299 - 528 (408) / 314 - 585 (445). Posttesticular region 23.3 - 33.3 (27.4) % of body length. Cirrus-sac well developed, 311 - 735 (589) / 155 - 261 (201), overlaps usually 20.5 - 78.8 (44.6) % of ventral sucker, occasionally extends to 142 beyond posterior margin of ventral sucker. Internal seminal vesicle long, tubular, folded. Pars prostatica tubular, surrounded by numerous prostatic gland-cells. Ejaculatory duct and cirrus distinct, surrounded by spongy tissue. Genital atrium distinct. Genital pore usually median, occasionally slightly dextro-submedian, just posterior to intestinal bifurcation, 169 - 424 (225) from anterior margin of ventral sucker. Female reproductive system Ovary variously lobed, median or dextro-submedian, anterodextral to anterior testis, separate or slightly overlapping, 200 - 414 (258) / 285 - 599 (409). Oviduct anterior to ovary, forming oötype after connecting with canalicular seminal receptacle and common vitelline reservoir duct. Ovicapt distinct. Canalicular seminal receptacle saccular, antero-dextral to ovary. Laurer’s canal opening sinistro-submedially approximately at level of anterior margin of seminal receptacle. Mehlis’ gland extensive, diffuse. Uterus pre-ovarian, coiled, intercaecal. Metraterm muscular, opening into genital atrium antero-dorsally. Eggs operculate, with long, unipolar filament; length without filament 66.8 - 85.0 (77.9), width 30.4 - 42.5 (35.7). Vitellarium follicular; follicles in two lateral fields, extending from intestinal bifurcation level or from genital pore level or, occasionally, from midlevel distance between genital pore and anterior margin of ventral sucker to near posterior end of body; fields overlapping caeca along entire length dorsally and at level of posterior testis and in posttesticular region ventrally, encroaching over ventral surface of caeca at level of proximal uterine coils, ovary and anterior testis, extracaecal on ventral side of body anteriorly to ovary, usually not confluent, occasionally almost confluent in posttesticular region but distinctly separated over excretory vesicle; anterior border of ventral follicles some distance posterior to that of dorsal follicles. Excretory system Excretory pore terminal. Excretory vesicle I-shaped, extending approximately to posterior margin of ventral sucker; posterior end surrounded by numerous glands and small subterminal muscular sphincter.	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
D255879FFFCCCD7351C38A89FE8EF94A.taxon	description	(Fig. 3)	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
D255879FFFCCCD7351C38A89FE8EF94A.taxon	materials_examined	TYPE LOCALITY. — Tyrrhenian Sea. TYPE MATERIAL. — We could find no information about deposition of K. A. Rudolphi’s original H. fasciata material. MATERIAL EXAMINED. — Black Sea • 6 adult whole-mounted, 1 sequenced specimens; Severnaya Bay, Crimean Peninsula; intestine of the black scorpionfish, Scorpaena porcus; 44 ° 37 ’ 32 ” N, 33 ° 32 ’ 7 ” E; 27. VII. 2000; ISSS RAS 1369. Tr. 39. v 2 - 15; GenBank: OK 644194 (28 SrRNA gene).	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
D255879FFFCCCD7351C38A89FE8EF94A.taxon	description	DESCRIPTION General morphology and digestive system Body elongate-oval, length 1.464 - 2.383 (1840), maximum width 620 - 726 (675) in posterior half of body. Tegument unarmed. Pre-oral lobe absent. Oral sucker spherical or subspherical, 140 - 189 (167) / 144 - 184 (167), mouth opening subterminal. Ventral sucker globular or subglobular, 215 - 285 (237) / 199 - 250 (224). Oral sucker to ventral sucker width ratio 1: 1.21 - 1.55 (1.35). Forebody 30.5 - 36.4 (33.9) % of body length. Prepharynx short, distinct. Pharynx well-developed, 47 - 83 (67) / 43 - 88 (59). Intestinal bifurcation in second or posterior third of forebody. Caeca blind distance from caecal ends to posterior end of body reaching 95 - 171 (137). Male reproductive system Two testes, variously lobed, contiguous, median, tandem, post-equatorial; anterior testis 172 - 282 (206) / 283 - 470 (401), posterior testis 188 - 394 (268) / 359 - 447 (381). Posttesticular region 13.3 - 18.2 (14.9) % of body length. Cirrussac well-developed, 319 - 551 (433) / 65 - 93 (78), overlapping 2.4 - 28.7 (22.4) % of ventral sucker. Internal seminal vesicle long, tubular, folded. Pars prostatica tubular, surrounded by numerous prostatic gland-cells. Ejaculatory duct distinct, cirrus not visible. Genital atrium indistinct. Genital pore median, at midlevel of oesophagus. Female reproductive system Ovary variously lobed, median or slightly dextro-sumedian, anterior or slightly antero-dextral to and slightly overlapping anterior testis, 89 - 136 (118) / 290 - 393 (340). Canalicular seminal receptacle saccular, antero-dextral to ovary. Laurer’s canal and oötype together with Mehlis’ gland not visible. Uterus preovarian, coiled, intercaecal. Metraterm not visible. Eggs operculate, with long unipolar filament; length without filament 63.0 - 87.3 (75.1), width 26.1 - 40.2 (34.2). Vitellarium follicular; follicles in two lateral fields, extending from level anterior quarter or middle of oesophagus to near posterior end of body; fields overlapping caeca dorsally in forebody and uterus area and ventrally in post-testicular region, usually encroaching caeca along rest of their length ventrally and dorsally, not confluent in post-testicular region, usually confluent on dorsal side of forebody; anterior border of ventral follicles some distance posterior to that of dorsal follicles. Excretory system Excretory pore terminal. Excretory vesicle clavate, extending to ovary, posterior end surrounded by numerous glands and small subterminal muscular sphincter. PHYLOGENETIC DATA BI and ML analyses supported the sister position of H. antarcticae to Helicometra sp. described in this study (Fig. 4). The divergence between these species was low (p-distance = 0.7 %). The H. antarcticae + Helicometra sp. clade had a sister relationship with the well-supported clade containing Helicometrina nimia Linton, 1910 and other Helicometra spp. Helicometrina nimia was sister taxon to the well-supported terminal Helicometra epinepheli Yamaguti, 1934 + (H. fasciata sensu lato + Helicometra manteri Andres, Ray, Pulis, Curran & Overstreet, 2014) subclade, though this sister relationship was poorly supported in both analyses. Helicometra equilata (Manter, 1933) Siddiqi & Cable, 1960 occupied a basal position to H. nimia and members of the terminal subclade mentioned above.	en	Sokolov, Sergey G., Shchenkov, Sergei V., Khasanov, Fuat K., Kornyychuk, Yuliya M., Gordeev, Ilya I. (2022): Redescription and phylogenetic assessment of Helicometra antarcticae Holloway & Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902. Zoosystema 44 (15): 423-433, DOI: 10.5252/zoosystema2022v44a15
